Osteoporosis is a common comorbidity in anorexics (4), and several factors can increase its risk: weight loss, weight loss, amenorrhea and low estrogen blood, high cortisone levels, insufficient Vit D and calcium absorption, all of which diminish bone formation and increase bone resorption. Whereas its treatment is undoubtedly weight gain and more Vit D and calcium rich foods, estrogen replacement therapy is less effective. Adults have about 1 kg of calcium in their bodies, and the vast majority of it is located in bones and teeth, so it is important to increase bone mass, and Vit D, which promotes calcium absorption in the intestinal canal, should not be neglected. The effects of calcium and Vit D on bones continue throughout life, and are especially important for children during the growth period and postmenopausal women, and also have an important role in increasing bone mass in the elderly. Calcium supplementation is divided into medications and calcium in food, with the focus here on calcium in food. Foods with high calcium content include oatmeal, dried tofu, curd, cloud beans, alfalfa, capers, kelp, peanut kernels, cheese (cheese), buttermilk powder, egg yolk, pangasius (canned), dried fish fillets, snails, shrimp skin, sea rice, Tieguanyin tea, sesame seed paste, etc. In addition to adequate protein and vitamin C that must be maintained in the daily diet, adequate calcium (not less than 1000mg per day) is needed to provide sufficient raw materials for organic matrix synthesis. Prevention of osteoporosis should include calcium supplementation, more milk and dairy products, seafood and vegetables with high calcium content, etc. Prevention of calcium deficiency during adolescence can significantly reduce the risk of osteoporosis in old age, so it is meaningful to eat more calcium- and vitamin D-rich foods when you are young and to strengthen weight-bearing exercise to prevent osteoporosis in old age. In order to ensure good absorption of calcium, it is necessary to ensure sufficient VitD. VitD content is more in fish, mushrooms, eggs also contain more, in meat, except duck, wild duck, contains very little or not at all. Other foods, such as cuttlefish, octopus, shrimp, cereals, potatoes, legumes, vegetables, fruits, and algae do not contain VitD. A balance of high protein, high calcium, and high phosphorus for calcium is the best dietary formula. Calcium to phosphorus ratio should be maintained at 1:1, animal experiments have proved that when the ratio of calcium and phosphorus is lower than 1:2, calcium dissolution and detachment from the bones increases, which can lead to osteoporosis in serious cases. In addition, attention should be paid to unreasonable meal preparation, for example, spinach contains oxalic acid, which can form unabsorbable calcium oxalate with calcium in tofu and milk, and fatty acid calcium with fat, thus affecting calcium absorption, so it should be avoided as much as possible. Slina et al. conducted an experimental study on soybeans, which can reduce de-oval serum ALP activity and urinary HYP excretion, increase intestinal calcium absorption and reduce urinary calcium excretion, thus increasing calcium absorption rate and calcium reserves, thus preventing osteoporosis.